What happens to the Mapper task if JobTracker stops responding suddenly due to an unknown reason?

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Rajendra Mahakali

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Namenode and JobTracker are SPOF (Single point of failure), If for any unknown reason the JobTracker fails, then all datanode and tasktracker will fail to send the ACK, and or heartbeat to the datanote/JobTracker. The result of both mapper or reducer will be redundant and the Namenode must be made available...
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Namenode and JobTracker are SPOF (Single point of failure), If for any unknown reason the JobTracker fails, then all datanode and tasktracker will fail to send the ACK, and or heartbeat to the datanote/JobTracker.The result of both mapper or reducer will be redundant and the Namenode must be made available online, so that all the job can be retriggered. read less
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